Yes they can, the senate amends them.
No all bills of revenue must originate in the house of representatives
Tax bills may be written only by the House of Representatives. The House of Representatives can also originate revenue bills.
In the House of Representatives.
The House of Representatives
House of Representatives.
The Senate has the power to initiate tax bills
House of Representatives
Tax
Tax bills must originate in the House of Representatives according to the Constitution.
The House of Representatives
Tax legislation can only be introduced by the U.S. House of Representatives. The House can also introduce bills pertaining to spending.
House of Representatives